Steam friction device.



E. A. STRAND.

STEAM FRICTION DEVICE.

APPLICATION FILED SEPT. 25, 1913.

1,1 1 3,71 1. Patented 0ct.13,1914.

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To all whom it may concern v I Belt known-that .1, Er c ALFRED STRAND,

av citizen of the United 'States, residing at the. city of Vancouver, 1n the Province of British Columbia, Canada, have invented certain new and useful Improvements in Steam FrictionDevices, of which the following is a specification.

My invention relates to improvements in steam friction devices, with. more particular reference to those used for'engargi'ng the drumsof 1 drum engines, such as hoisting and haulage engines, on to the friction blocks, and the ob ect of my invention 18 to devise a steam friction in which-it is possible to-apply steam pressure to both sides of the piston alternately, thus making 1t possible to engage or release the drumon and'oif the friction blocks by steam, with equal facility, instead of, as at the present time, engaging the drum by steam and then depending on sprin means for eiiiccting its release. I atand shaft, showing my steam frictiondevice adapted thereto.

Similar figures of reference indicate similar parts throughout the sereralviews.

1 represents the drum of a typical drum 2 is the driving gear.

3 are the friction blocks.

4 is the drum spring.

"5 isthe drum shaft.

6 is the drum collar.

7 is the cross key.

Sand-9 are the main-bearings.

1.0 isthe friction pin.

11 is the steam friction piston.

12 is the'steam friction cylinder.

13 is thecylindcr head.

14 is the piston bushing.

15 is the steam pipe.

16 is the steam pipe stuffing box.

Referring now to Fig. 1, which illustrates the present mode of engaging thedruin 1 by steam means and of releasing it by spring means, it will be seen that the action is as follows: When it is desired to engage the drum 1 on to the friction blocks the steam Specification of Letters Yatent.

Application filed September serial No. 791,!88.

piston.

Patented @et. 33, 122. 1

is turned into the cylinder 12 through the steam pipe to exert a pressure on the outer surface of the piston 11, a nd this pres- 1 sure is transmitted by means of the friction pin 10 andcross key 7 to the drum. collar 6, which hears against theend of thedruin, and thus the charm is forced against the spring and on to the friction blocks 3, the spring t remaining in con'ipression until the drum is released. When it is desired to release the drum from the friction blocks to allow it to run free, the pressure on the outer end of the drum is rel eved by allowing whereupon the drum spring t expands and forces the drum off the'friction blocks 3. in practice, however,- it is found that while the steai'n means for engaging the drum is efficient, the spring means for releasing it is not quite so effective, since the effective release of the drum depends on the eiliciency of the springs. Consequontlyit frequently happens that the drum remains fast on the friction blocks, when it is intended to be released therefrom, due to'the failure of the spring to Work properly. It. is preferable, therefore, to use a drum releasing device similar to that shown in F151. 2, as more particularly hereinafter described, andin order that this device should be workable by steam, to

either engage or release the drum with equal facility, it is necessary to be able to apply the steam pressure alternately to both sides of the piston connected to the device. This I am able to do by means of the-construction illustrated in Fig. 2, to which particular attention is now drawn and in Whichi 17 is the friction pin.

18-is the piston nut.

V1?) is the cross key collar.

the steam to exhaust out of the cylinder 12,

20 is a casing attached to-the drum end' and inclosing the cross key 7 and the collars I 6 and 19.

21 arethe piston springs. v

-22 isthe steam pipe for the front of the 23 is the piston.

24 is the smiling box for the steam pipe 23.

steam pipe for the hack of the 25 is an. annular bore extending inwardly into the body of the friction pin 1?.

26 is a. transverse bore through the friction pin 17 and in connection With the bore 25 to provide an outlet theref0r.

27 is a 'l' connectionaciapted for the suitable arrangement of the steam pipes 22 and 23.

28 is a four way steam valve.

29 is the handle therefor.

30 is the main steam supply pipe.

31 is the main exhaust pipe.

Still treferring particularly to Fig. 2, it

- will be seen that any forward movement of 4 the friction pm 17 will cause the cross key 7 to bear onthe dnum collar 6 and thus force the drum 1 on to the frictionbloeks 3, while the reverse movement will cause the cross key 7 to bear on the collar 19 to exert a. pull on the casing 20, thus pulling the drum 1 off the friction blocks 3, and effectively releasing it, therefrom; 'Therefore, if the piston. 11 be permanently secured to the friction pin, in-

steadof being loose thereon, as in Fig. .1,

and steam he turned in to the cylinder 12 to exert a pressure on the front and back of the piston alternately as required,'the results above mentioned will be attained.

The manner, therefore, in which my steam friction device is assembled and operated is as follows: The piston'll is fitted on to the outer end of the friction pin, and secured thereto by the nut 18 or any other approved mechanical means. The annular bore 25 and transverse bore 26 connecting therewith areprovided so that-there will be a passage through from the outside to the space behind the piston when the piston "is in place..-

After the piston has been fitted to the friction pin and assembled, the cover 13 may be put on, and the steam pipes connected up as shown in Fig. 2, that is, the ipe 22 makes a connection through the stu g box 16, to the space in front of thepiston from the valve. 28, while the pipe 23 makes a similar connection through the stalling box 24, the

T 27,,the pipe 22, the annular bore 25, and th'etransverse bore 26 with the space behind "the piston. If new itis desired to engage "the drum on to the friction blocks, the plug in the. valve'28 is moved so therein'f will admit live steam through the through'the pipe 23. If it is desired to release the drum from the friction blocks, the action described in the foregoing is reversed,

that is, the plug in the valve 28 is moved so that the ports therein will admit livesteam throiwh the pipe 23 and the bores 25 and 26 into the space behind the piston, While the other ports will be open to the space in front of the piston and the exhaust pipe 31, thus allowing the steam therein to be exhausted. By this means the steam pressure is exerted on the front and back of the piston alternately, to cli'cct the engagement or release of the. drum, as described.

It will be seen, therefore, that I have devised a steam friction device, adaptable to the drums of drum engines and the like, in

which it is possible to apply steam pressure on both sides of the piston alternately, thus making it possible to either engage or release the drum on to or from the friction blocks, by the use of steam in both cases, instead of, as at the present time, engaging the drum by steam and then having to depend on spring means for effecting its release.

What I claim as my invention is- In a clutch actuating device, the combination with a main supporting shaft having an axial bore in one end thereof and a drum loosely mounted upon the shaft, of a pin slidably held in the bore, connecting means between the inner end of the pin and the, drum, a piston mounted upon the outer end of the pin, a cylinder in which the piston operates, a duct extending longitudinally through the pin from the outer end thereof and leading into the cylinder at the opposite side of the piston, a stationary duct leading into the outer end of the cylinder, an inner steam duct leading through the aforesaid steam duet into the duct of the pin, means for feeding steam in the said ducts, means for exhausting steam therefrom and a controlling valve designed to alternately open the alternate ducts to the steam inlet and exhaust, as and for the urpose specified.

Dated at ancouver, B. 0., this 5th day of September, 1913.

ERIC ALFRED STRAND. 

